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Warre hive roof

The design has a quilt box to hold the straw/saw dust etc. Then the roof sits on that with a board attached completely. Does this board not prevent the flow of air and thus reduce the escape of heat? I was under the impression that the sawdust controlled the escape of air as an insulator and a top board was no longer needed.

Or is the top board to act as in a Lang hive but the insulation below simply to absorb condensation?